There are 4 of these on my 6.5 topper and it doesn't move. Yes, double the seal tape on the bed liner rail. My rails are bed liner too. I've seen some of the front panels top rail be lower than the sides and need an extra layer of seal too, if the water is getting in the front. The only area that leaks on my A.R.E is the door gasket. Their design/seal sucks.
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Mitch
1970 Chevelle SS
1966 Chevelle SS
1967 Camaro ss/rs
1938 Business coupe, street rod
2000 FXSTS, original owner, 13k miles
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